Mold for centrifugal casting



liec. 14, 1926.

L. CAMMEN MOLD FOR CENTRIFUGAL CASTING Filed March so, 1926 mam , [eon Q/mmen;

, INVENTO Patented Dec. 14,1926;

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Application filed March 30, 1926. Serial No. 98,546.

The present invention refers to a machine for 'casting centrifugally such objects as split tubes, bars, ingots, gears and the like, and generally objects in the casting of which is used a mold of which the inner surface is not smooth but equipped with projections. The invention set forth here is a modification and develo ment of the one covered by U. S. Patent 0. 1,490,589.

In the illustrations,

Fig 1 is a section through the mold in a plane normal to the axis of, rotation; as at.

AB, Fig. 2;

Fig. 2 is a section through a plane'comprising the axis of rotation.

Fig. 3 is an end view of a gate which may be set at 21, Fig.2.

The mold shown in myU. S. Patent No. 1,490,589 above referred to consists essentially of two parts disposed along the axis of rotation, one smooth, against which the metal of the casting is fed. and the other equipped with projections of a shape suitable for the desired casting. If metal were fed directly against the part of the mold equi ped with the projections while the mol is spinning, it would be struck by the projection, scattered, and ultimately cause cold shuts in the casting. If it is fed against the smooth part, it acquires the speed of the mold before coming into contact with the projections, and hence there is no blow and no tendency for the metal to seatter. On the other hand. however, the metal has to be all supplied from one end, and distributed from end to end of the .mold by.

the pressure produced by centrifugal force which naturally limits the length of the objects that can be cast. This is particularly so in the case of metals which freeze very rapidly, or which have to be cast at temperatures ver close to their temperature of solidification. The present invention eliminates these limitations.

The mold consists here of two parts, disposed along the axis of rotation, mold proper 1 and distributor 14 (Fig. 2). The mold proper may be equipped with projections, 'such' as'6' (Fig. 1). The mold is also equipped with heads or gates 12 and 13 whichmake the metal build up in the mold to the desired thickness. rather than fly off in the. direction arallel to the axis of rotation, The distri utor, part of the mold, 14,

may be equipped with such a head or gate,

ciety of MechanicalEngineers, vol. 44, 1922,

pp. 284-5). In Fig. 2 the gate 15 does not permit the metal to flow beyond that point Y to the right, but it is free to discharge over In doing so, the metal the edge to the left. falls onto the mold proper 1 and fills the spaces between the projections 6. There is no blow however of the rojections 6 against the metal, as there wou ld have been if the metal were discharging from the spout 17 directly into'the mold 1, becailse as far as the relation of flowing metal and projections 6-is concerned, both the distributor and the mold, running at the same or approximately the same speed, may be considered as-relativelystandin still. The means for rotating the mold proper and distributor 14 are not shown, as they are matter of common on ineering knowledge. I

he mold proper 1 and distributor 14, ifdesired, may be given a relative displacement longitudinally, by shifting endwise either the mold proper or the distributor while the metal is being supplied to the art would know howto accomplish it.

The distributor 14 may have. its-inner surface cylindrical, conical, or cylindrical in one part, and conical in another part. the selection of any particular arrangement bein merely a matter of design.

n my U. S. Patent No. 1,553,136, I have shown partition lugs equipped with shoulders to keep the casting from falling away from the mold to a greater extent than is desired, and for other purposes set forth in the above patent. A lug similar to those shown in the patent here referred to is shown in Fig. -1 at 18.' This lug has its upper face 19 shaped as part of an arc of a circle drawn about the axis of rotation; There is no objection to this with the usual bottle-neck mold, such as shown in my Patent No. 1,490,589, because there the metal of the casting never comes in contact with the upper face of the lug. With a mold having a rotating distributor such as 14 in the present invention, part of the metal discharges over the lug. It is therefore desirable to make the upper face of the lug of such a shape that the metal would have as little as possible tendency to stay on it, and that on the contrary'itwould discharge from it with as little splashing as possible.

This can be done in several .ways, as by giving the 'top of the lug a face with a slant, as at 11, or'a' gable, as at 24,-"or any com bination or known modification of these two roof types. -Itis therefore proper to describe the upper face of the lugs as roofshaped, this term being here applied to the" above two types of roof, their known combinations an modifications. Thus, e. g., the gable 24. might easily be modified to a parabolic section without changing the intent and purpose of the invention.

Where there is no relative motion along the axis of rotation between the distributor" 1 discharging over the'lugs,but to provide for a free discharge of themetal into the spaces between the lugs. The value of this" arrangemen't would be lost wherethe distributor does not run at the same'speed as the mold proper. Infact, where such an arrangement is used, the distributor might be attached solidly to vthe mold proper, and only one of them directly driven. An

- 3 equivalent arrangement might be adopted washing the metal of the mold away.

by providing the end 21 of the distribu tor with ,a gate similar to 13, andjthen cutting in the distributornear the gate referred to, slots. g

Where the distributor has no longitudinal dis lacement, it may be well to equi the mo d proper with a ring of fireproo slaces where the metal coming from the stributor strikes the mold, to prevent As regards the relative rotational'speed of the mold proper and the distributor, there is no advantage whatsoever in having the speeds of the two, in revolutions per umt of time, difl' er. On the" other hand, apart from possible lashing of the metal where it h tsthe top ares of the lugs, there s no disadvantage in having them vprojecting into the second one,

run at slightly different speeds. A great difference in speed would be produclve of splashing and scattering of the metal.

No reference to the matter of relative rotational speeds of 1 and 14 is made in the claims as this factor does not enter into the design of the mold, but may be controlled by the motor drive.

I claim: v

1. A mold for centrifugal casting consisting of two parts disposed along the axis of rotation, of which parts the one a ainst which the metal of the castin .is fed, smooth internal surface, and e other part has projections of a shape suitable for the desired casting, and the former of the two projects'into the latter and is connected thereto.

2. A mold for centrifugal casting consist- I ing of two parts disposed along the axis of rotation, of which parts the one against which the metal of the casting is fed, has a smooth internal surface of cylindricalshape, and the other part has projections of a shape suitable for the desired casting, the first of said two parts above referred to projecting into the second one, and being connected thereto.

3. A mold for centrifugal casting consisting of two parts disposed along the axis of.

rotation, of which parts the one against which the metal of the casting is fed has a" smooth internal surface of the shape of a truncated con'e contracting towards the pour ing end, and the other part has projections" of a shape suitable for the desired casting,

the first of said two partsabove referred to and being connected thereto.

4. A mold for centrifu a1 casting consisting of two parts dispose along the axis of rotation, o which parts the one against which the metal of the castin is fed has a smooth internal .surface'of a s 1a e which is a combination of cylindrical an truncated cone with the latter contracting towards the pouring end, and the other part has projections of a shape suitable for the desired casting, thefirst of said two parts above.re

,ferred to; projecting into the second one and being connected thereto.

5. A mold for centrifugal casting consistr of two arts disposed along the axis of material, such a clay or cement, in the.

rotation, .0 which parts the one against which the metal of t e castin'- is fed has a smooth internal surface, and t e other part which the metal of the is fed has a.

a] casting consistsmooth internal, surface of cylindrical shape, ferred to projec and the other rt has projectionsof a shape suitable for te desired casting, the first of said two parts above referred to projectin "into the second one and both being provide r with means for imparting to them a rotary motion;

7. A mold for centrifu alcasting consisting of two parts dispose along the axis of rotation, of which arts the one against which the metal of th truncated conecontracting towards the pouring end, .and the other part has projections of a shape'suitable for the desired casting,

'- the first of said two-parts above referred to tions of 'a I shape projecting into the second one and both being provided with means for imparting to; them a rotary motion.

8. Ajmold forfce'ntrifugal casting consisting of-two parts dispose along the axis of rotation, of which which the metal of ecast' is fed has a smooth internal surface of a s a 'e-which is a combination of cylindrical an truncated cone with the latter contracting towards the the other part has projec-' curing end and P suitable for the desired casting, the first of said two parts above rewhich the metal of smooth internal surface, and the other-part has, projections of a shape suitable for the? e. casting is fed has a smooth internal surface of the shape of aarts the one against desired casting, the former of the two pro jecti'ni v toan being provided at he discharge end with means to direct the flow ofliquid metal therefrom into the .spaces between the prov V jection's a We referred-to and to kee said flow of liquid. metal away from 'sai ections.

Q10. A rnoldjor centrifugal casting consist-2 ing of two parts disposed alongthe axis of rotation of which parts the one against f which the metal of the casting isfed, has a smooth internalsurzlface, and the other-part into the" second one and with means for impart- I into the latter; bein connected therepro-.

has projections of a shape suitable for the desired casting and roof-shaped tops, the first of said two parts'abovc referred'to projecting into the second one. v

Signed'n New York, in the county-and State of New York March 26 A. n. 19 6. LEON dammit. 

